How do I install a domain certificate onto a MAC client?

My MAC client appears to need a certificate installed in order to access my windows domain.  It is not being prompted (as I believe it should do) so I want to do it manually, but where do I find the certificate and how do I install it onto the MAC?
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David Johnson, CD, MVPOwnerCommented:
login to the certificate authority website and download the certificate and then
follow the instructions @ to install the certificate. Safari may import the certificate for you
fuzzyfreakAuthor Commented:
This is a self signed certificate - internal domain only.
David Johnson, CD, MVPOwnerCommented:
self signed keys are always untrusted but export the key copy it to the mac and then install the key
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fuzzyfreakAuthor Commented:
I was hoping for instructions on how to export the key from Windows, please.
Microsoft has instructions on exporting a self signed certificate.

You need to load the Certificates MMC, Select the host, and then Export it.

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fuzzyfreakAuthor Commented:
Thank you, I shall give this a go.
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